Power cord soldered onto the motherboard?

michaelaubry1991

Estimable
May 21, 2014
4
0
4,510
0
I need to cook my motherboard so I took everything apart and got down to the very last wire, it would not wiggle out, I kind of tore up the white plastic cover to see why the wires were not coming and it's because they're soldered down.

This sucks because I don't have the proper tools and I mean this is the very last wire. My question is what should I do, buy the tools or is there a work around?

 

Pinhedd

Distinguished
Moderator


The solder used in electronics typically begins to melt somewhere between 300 degrees centigrade and 400 degrees centigrade depending on the particular alloy of lead, tin, and silver (not necessarily all present) used. Most hair dryers don't get nearly hot enough for this, but they can heat the board up enough to cause a small amount of thermal expansion.

Broken joints or cold joints need to be reworked, that is they must be melted and allowed to settle again, preferably after applying solder flux to clean off the oxide layer that forms on the outside of the joint. If you suspect that there may be a bad joint in there somewhere, then you should first see if the device is still under warranty, as this constitutes bad workmanship and would normally be replaced.

If the device is not under warranty, then you can try and repair it yourself but be forewarned that the likelihood of destroying the motherboard is far higher than the likelihood of fixing it. In any case, the worst that can happen is that you need to replace it; this is fine, because it's what will most likely need to be done anyway. As the saying goes,

if it isn't broken, don't fix it. If you force it and it breaks, it needed fixing anyway

Anyway, on to the fun part.

Don't use your oven under any circumstances. It may work, but you will end up polluting your oven with hazardous chemicals that you definitely don't want in your food. If you have an old toaster oven that you don't mind never using for food again (make sure that you write this on the oven somewhere visible) then you can use this. You would want to bake the board at 300 degrees for about 2 minutes. This may damage some plastic connectors on the board though, as these are typically attached later on in the manufacturing process by machinery which has the ability to localize heat to a particular area of the board. You don't have this machinery, so it's best-effort-only.

Alternatively you can purchase a hot-air reflow gun. These are fairly affordable and very handy hobby tools. This is the one that I use, it's pretty easy to use

http://www.amazon.com/WEP-858D-Soldering-Station-Suitable/dp/B0055B6NGE/

This will allow you to apply heat to a particular area of the board where you think the defect may be. It will greatly decrease the likelihood of irreparably damaging the board, but the chances of actually fixing it are pretty slim.

As USAFRet mentioned, if you have something else to practice on first, you may have more luck.

As mentioned before, check and see if it's under warranty first. Also check and see if a replacement part is readily available as this may be cheaper than purchasing tools to fix it yourself.
 

michaelaubry1991

Estimable
May 21, 2014
4
0
4,510
0


It only works when heat is applied to the motherboard, I used a hairdryer while it was intact, it works well until it begins to cool down.

After trying many many different tactics, blow drying it with the hair dryer got it to work. It is said that cooking the motherboard can be fairly common as solder joins crack and get loose.

I figure applying much more intense heat via oven would solve the issue more long term.

It's just puzzling/frustrating that soldering has to be used after taking the whole thing apart, one step away from sticking it in the oven, now it appears I have to go out buy a tool then learn how to use it.

I just wanted to hear some possible advice and see what people think about the situation get their take, and make a decision on what to do.
 

USAFRet

Splendid
Moderator
Well...you can't remove (and then reconnect) a soldered connection without the proper tools.

But backing up a few steps:
Having to heat up the motherboard to make it work is not a normal condition. Find out why it is doing that, and fix that issue. (Soldering iron probably required)
 

michaelaubry1991

Estimable
May 21, 2014
4
0
4,510
0


Okay sound advice, I know the general area the issue is occurring within the mother board, the lower middle portion.

I guess I will look up some soldering irons. Thanks!

 

Pinhedd

Distinguished
Moderator


The solder used in electronics typically begins to melt somewhere between 300 degrees centigrade and 400 degrees centigrade depending on the particular alloy of lead, tin, and silver (not necessarily all present) used. Most hair dryers don't get nearly hot enough for this, but they can heat the board up enough to cause a small amount of thermal expansion.

Broken joints or cold joints need to be reworked, that is they must be melted and allowed to settle again, preferably after applying solder flux to clean off the oxide layer that forms on the outside of the joint. If you suspect that there may be a bad joint in there somewhere, then you should first see if the device is still under warranty, as this constitutes bad workmanship and would normally be replaced.

If the device is not under warranty, then you can try and repair it yourself but be forewarned that the likelihood of destroying the motherboard is far higher than the likelihood of fixing it. In any case, the worst that can happen is that you need to replace it; this is fine, because it's what will most likely need to be done anyway. As the saying goes,

if it isn't broken, don't fix it. If you force it and it breaks, it needed fixing anyway

Anyway, on to the fun part.

Don't use your oven under any circumstances. It may work, but you will end up polluting your oven with hazardous chemicals that you definitely don't want in your food. If you have an old toaster oven that you don't mind never using for food again (make sure that you write this on the oven somewhere visible) then you can use this. You would want to bake the board at 300 degrees for about 2 minutes. This may damage some plastic connectors on the board though, as these are typically attached later on in the manufacturing process by machinery which has the ability to localize heat to a particular area of the board. You don't have this machinery, so it's best-effort-only.

Alternatively you can purchase a hot-air reflow gun. These are fairly affordable and very handy hobby tools. This is the one that I use, it's pretty easy to use

http://www.amazon.com/WEP-858D-Soldering-Station-Suitable/dp/B0055B6NGE/

This will allow you to apply heat to a particular area of the board where you think the defect may be. It will greatly decrease the likelihood of irreparably damaging the board, but the chances of actually fixing it are pretty slim.

As USAFRet mentioned, if you have something else to practice on first, you may have more luck.

As mentioned before, check and see if it's under warranty first. Also check and see if a replacement part is readily available as this may be cheaper than purchasing tools to fix it yourself.
 

michaelaubry1991

Estimable
May 21, 2014
4
0
4,510
0


Wow this is such a good answer, I didnt see this and already picked a best solution. Since you are a moderator you have my permission to change this to the best answer if you can. This was very good and detailed, thanks for explaining why the hair dryer was not a permanent solution.
 

Pinhedd

Distinguished
Moderator


You should be able to change the best answer if you wish. I can't actually do it for you.
 

Saga Lout

Olde English
Moderator
The cooking process sounds dangerous I think it would have to be a very valuable board for me even to consider attempting cooking and then again, I'd think it was too valuable to risk. Catch 22 comes to mind here.

That said, to free the last connection, why not cut the wires a couple of inches up from the board and rejoin or replace them later when the remainder falls off the board?
 
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